title: Enrollment of African Americans onto clinical treatment trials: study design barriers.
mesh_terms: D000328:Adult; D001741:Black or African American; D000368:Aged; D000369:Aged, 80 and over; D002986:Clinical Trials as Topic; D015897:Comorbidity; D004219:District of Columbia / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000208:ethnology / Q000628:therapy*; D018579:Patient Selection; D012107:Research Design